Henry j



(No Model.)

H. J. SEYMOUR. PUMP PIsToN.

No. 475,812. Patented May 31, 1892.

INV NTOR.'

WITNESSES.-

j# Mm Tg3 t/Z7 1 ATTORNEYS,

UNITED STATES PATENT OFFICE.

HENRY J. SEYMOUR, OF NIAGARA, CANADA.

PUMP-PISTON.

SPECIFICATION forming part of Letters Patent No. 475,812, dated May 31, 1892.

Application filed April 25, 1891. Serial No. 390,493. (No model.)

To a/ZZ whom it may concern.-

Be it known that I, HENRY J. SEYMOUR, a citizen of the United States, and a resident of Niagara, in the Province of Ontario, Dominion of Canada, have invented new and useful lmprovements in Pump-Pistons, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to the class of pistons which are employed in lift-pumps and suction-pumps; and it has special reference to the species of pump-pistons in which the pistonrod is allowed a longitudinal movement independent of the piston and has secured to it a valve beneath the piston.

The object of the invention is to simplify the construction of the piston and increase its efficiency; and to that end it consists in the improved construction and combination of parts, hereinafter fully described, and specifically set forth in the claim.

In the annexed drawings, Figure l is a side view of a pump-piston embodying my improvements. Fig. 2 is a vertical .transverse section of the same, and Fig. 3 is a horizontal transverse section on line .r Fig. 2.

Similar letters of reference indicate corresponding parts.

P represents the pist-on, which I form of a single metallic ring provided with the central port d and with a plain annular horizontal valve-seat on its under side. The exterior of said ring is formed with rigid circumferential outward flanges on top and bottom and the groove b between said flanges, in which groove is seated the packing-ring c of leather or other suitable material severed diagonally, as shown at c in Fig. l, to allow said ring to be introduced into the groove.

e represents the piston-rod, which terminates in a yoke or cross-bar e above the ring P, said cross-bar extending across the top of said ring to form shoulders f f, by which to engage the ring during the downward movement of the piston-rod. From the yoke or cross-bar depend rigid arms c c, which extend through the ring P at the inner sides thereof, so as to leave the central and main portion of the said rin g free from obstructions to the passage of the Water, which is thus allowed to rise more freely through the ring P. To the lower ends of the aforesaid arms is firmly secured the plain metal plate d, which spans the opening d and laps with its marginal portion over the aforesaid plain horizontal valve-seat on the bottom of the :ring P to serve as the valve for the piston,which valve is free from liability of becoming bound on its seat. The depth between the shoulders fand plate CZ exceeds that of the ring sufficiently to afford a longitudinal movement to the pistonr0d independent of the ring or piston P.

To guard against the tilting or canting of the ring P, Ilprovide the interior thereof with vertical grooves c' t', through which the vertical arms e e pass, as shown in Fig. 31 of the drawings.

In the Operation of the pump at the downward stroke of the piston-rod e the arms c e move freely in the grooves t and carry the plate or valve d down from the ring or piston P until the shoulders ff come in contact with the top of the piston, which causes the latter to move with the piston-rod. The piston is thereby carried down into the water in the pipe of the pump, and in this movement the water passes around the edge of the plate CZ and up through the aperture a of the piston. The upward stroke of the piston-rod raises first the plate d up against the under side of the piston P and then lifts the latter with it, together with the Water contained in the pump-pipe, above the plate CZ. The narrow ring P, with its large cental opening a., allows a large volume of water to be collected above the plate d during the downward movement of the piston-rod, and thus the efficiency of the pump is increased, and this improved result is attained by a very simple construe tion of the piston.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

The improved lift-pump piston consisting of the ring P, formed rigid with a plain horizontal annular valve-seat on its under side and provided with the vertical guide-grooves c' t' on its inner side, in combination with the piston-rod c, terminating in the cross-bar c above said ring, said cross-bar extending IOC.

across the top of the ring and formed with rigid pendent arms e e, extending,` through the grooves z' z' and leaving the central and main portion of the ring P free from obstructions to the passage of the Water, and the valve-plate d, fixed to the lower ends of the arms e e and carried beneath lche ring R and lapping onto the horizontal valveseab lhereof and free from friotional Contact therewith, all constructed and combined substan- 1o tially as described and shown.

In testimony whereof l have hereunto signed my name this 13th day of April, 1891.

HENRY J. SEYMOUR.

Witnesses:

MARK W. DEWEY, C. L. BENDIXON. 

